diff --git a/build.gradle b/build.gradle
index a6843b71..4daaa5ae 100644
--- a/build.gradle
+++ b/build.gradle
@@ -39,7 +39,7 @@ if (project.hasProperty('mod_appendix')) {
 }
 
 minecraft {
-    mappings = "snapshot_20171212"
+    mappings = "stable_39"
     version = "${minecraft_version}-${forge_version}"
     runDir = 'run'
 
diff --git a/src/main/java/com/enderio/core/client/handlers/SpecialTooltipHandler.java b/src/main/java/com/enderio/core/client/handlers/SpecialTooltipHandler.java
index be4618a7..1967392f 100644
--- a/src/main/java/com/enderio/core/client/handlers/SpecialTooltipHandler.java
+++ b/src/main/java/com/enderio/core/client/handlers/SpecialTooltipHandler.java
@@ -228,7 +228,7 @@ public static void addTooltipFromResources(@Nonnull List<String> list, @Nullable
       unlocalizedNameForTooltip = ((IResourceTooltipProvider) itemstack.getItem()).getUnlocalizedNameForTooltip(itemstack);
     }
     if (unlocalizedNameForTooltip == null) {
-      unlocalizedNameForTooltip = itemstack.getItem().getUnlocalizedName(itemstack);
+      unlocalizedNameForTooltip = itemstack.getItem().getTranslationKey(itemstack);
     }
     return unlocalizedNameForTooltip;
   }
diff --git a/src/main/java/com/enderio/core/client/render/RenderUtil.java b/src/main/java/com/enderio/core/client/render/RenderUtil.java
index 6331e5e0..b448fb66 100644
--- a/src/main/java/com/enderio/core/client/render/RenderUtil.java
+++ b/src/main/java/com/enderio/core/client/render/RenderUtil.java
@@ -180,7 +180,7 @@ public static float getColorMultiplierForFace(@Nonnull EnumFacing face) {
     if (face == EnumFacing.DOWN) {
       return 0.5f;
     }
-    if (face.getFrontOffsetX() != 0) {
+    if (face.getXOffset() != 0) {
       return 0.6f;
     }
     return 0.8f; // z
@@ -262,13 +262,13 @@ public static void renderBillboard(@Nonnull Matrix4d lookMat, float minU, float
    */
   public static List<EnumFacing> getEdgesForFace(@Nonnull EnumFacing face) {
     List<EnumFacing> result = new ArrayList<EnumFacing>(4);
-    if (face.getFrontOffsetY() != 0) {
+    if (face.getYOffset() != 0) {
       result.add(NORTH);
       result.add(EAST);
       result.add(SOUTH);
       result.add(WEST);
 
-    } else if (face.getFrontOffsetX() != 0) {
+    } else if (face.getXOffset() != 0) {
       result.add(DOWN);
       result.add(SOUTH);
       result.add(UP);
diff --git a/src/main/java/com/enderio/core/client/render/VertexRotationFacing.java b/src/main/java/com/enderio/core/client/render/VertexRotationFacing.java
index c1056478..67263987 100644
--- a/src/main/java/com/enderio/core/client/render/VertexRotationFacing.java
+++ b/src/main/java/com/enderio/core/client/render/VertexRotationFacing.java
@@ -31,7 +31,7 @@ public void setRotation(@Nonnull EnumFacing dir) {
   }
 
   public EnumFacing rotate(@Nonnull EnumFacing dir) {
-    if (dir.getFrontOffsetY() != 0) {
+    if (dir.getYOffset() != 0) {
       return dir;
     }
     if (getAngle() == ROTATION_AMOUNT) {
diff --git a/src/main/java/com/enderio/core/common/TileEntityBase.java b/src/main/java/com/enderio/core/common/TileEntityBase.java
index dcea69c5..4e673e3c 100644
--- a/src/main/java/com/enderio/core/common/TileEntityBase.java
+++ b/src/main/java/com/enderio/core/common/TileEntityBase.java
@@ -154,7 +154,7 @@ public final void onDataPacket(@Nonnull NetworkManager net, @Nonnull SPacketUpda
   protected void writeCustomNBT(@Nonnull ItemStack stack) {
     final NBTTagCompound tag = new NBTTagCompound();
     writeCustomNBT(NBTAction.ITEM, tag);
-    if (!tag.hasNoTags()) {
+    if (!tag.isEmpty()) {
       stack.setTagCompound(tag);
     }
   }
@@ -183,7 +183,7 @@ protected void updateBlock() {
   }
 
   protected boolean isPoweredRedstone() {
-    return hasWorld() && world.isBlockLoaded(getPos()) ? world.isBlockIndirectlyGettingPowered(getPos()) > 0 : false;
+    return hasWorld() && world.isBlockLoaded(getPos()) ? world.getRedstonePowerFromNeighbors(getPos()) > 0 : false;
   }
 
   /**
diff --git a/src/main/java/com/enderio/core/common/fluid/BlockFluidEnder.java b/src/main/java/com/enderio/core/common/fluid/BlockFluidEnder.java
index 5475c39c..613307bd 100644
--- a/src/main/java/com/enderio/core/common/fluid/BlockFluidEnder.java
+++ b/src/main/java/com/enderio/core/common/fluid/BlockFluidEnder.java
@@ -27,17 +27,17 @@ public abstract class BlockFluidEnder extends BlockFluidClassic {
   private float fogColorRed = 1f;
   private float fogColorGreen = 1f;
   private float fogColorBlue = 1f;
-  private final @Nonnull Material material;
+  private final @Nonnull Material fluidMaterial;
 
-  protected BlockFluidEnder(@Nonnull Fluid fluid, @Nonnull Material material, int fogColor) {
-    super(fluid, new MaterialLiquid(material.getMaterialMapColor()) {
+  protected BlockFluidEnder(@Nonnull Fluid fluid, @Nonnull Material fluidMaterial, int fogColor) {
+    super(fluid, new MaterialLiquid(fluidMaterial.getMaterialMapColor()) {
       // new Material for each liquid so neighboring different liquids render correctly and don't bleed into each other
       @Override
       public boolean blocksMovement() {
         return true; // so our liquids are not replaced by water
       }
     });
-    this.material = material;
+    this.fluidMaterial = fluidMaterial;
 
     // darken fog color to fit the fog rendering
     float dim = 1;
@@ -52,7 +52,7 @@ public boolean blocksMovement() {
   }
 
   protected void setNames(Fluid fluid) {
-    setUnlocalizedName(NullHelper.notnullF(fluid.getUnlocalizedName(), "encountered fluid without a name"));
+    setTranslationKey(NullHelper.notnullF(fluid.getUnlocalizedName(), "encountered fluid without a name"));
     setRegistryName("block_fluid_" + fluid.getName().toLowerCase(Locale.ENGLISH));
   }
 
@@ -83,7 +83,7 @@ public void setFogColorBlue(float fogColorBlue) {
   @Override
   public Boolean isEntityInsideMaterial(@Nonnull IBlockAccess world, @Nonnull BlockPos blockpos, @Nonnull IBlockState iblockstate, @Nonnull Entity entity,
       double yToTest, @Nonnull Material materialIn, boolean testingHead) {
-    if (materialIn == material || materialIn == this.blockMaterial) {
+    if (materialIn == fluidMaterial || materialIn == this.material) {
       return Boolean.TRUE;
     }
     return super.isEntityInsideMaterial(world, blockpos, iblockstate, entity, yToTest, materialIn, testingHead);
diff --git a/src/main/java/com/enderio/core/common/inventory/EnderInventory.java b/src/main/java/com/enderio/core/common/inventory/EnderInventory.java
index 68bef33f..fd523c60 100644
--- a/src/main/java/com/enderio/core/common/inventory/EnderInventory.java
+++ b/src/main/java/com/enderio/core/common/inventory/EnderInventory.java
@@ -128,7 +128,7 @@ public void writeToNBT(@Nonnull NBTTagCompound tag) {
       if (entry.getValue() != null) {
         NBTTagCompound subTag = new NBTTagCompound();
         entry.getValue().writeToNBT(subTag);
-        if (!subTag.hasNoTags()) {
+        if (!subTag.isEmpty()) {
           tag.setTag(NullHelper.notnull(entry.getKey(), "Internal data corruption"), subTag);
         }
       }
diff --git a/src/main/java/com/enderio/core/common/tweaks/SlabRecipes.java b/src/main/java/com/enderio/core/common/tweaks/SlabRecipes.java
index 02e29616..fde7cb73 100644
--- a/src/main/java/com/enderio/core/common/tweaks/SlabRecipes.java
+++ b/src/main/java/com/enderio/core/common/tweaks/SlabRecipes.java
@@ -29,7 +29,7 @@ public void load() {
 
   private static void addSlabRecipe(@Nonnull ItemStack stack, @Nonnull String slab) {
     ForgeRegistries.RECIPES.register(new ShapelessOreRecipe(null, stack, slab, slab)
-        .setRegistryName(slab + "_to_" + NullHelper.notnullM(stack.getItem().getRegistryName(), "found unregistered item").getResourcePath()));
+        .setRegistryName(slab + "_to_" + NullHelper.notnullM(stack.getItem().getRegistryName(), "found unregistered item").getPath()));
   }
 
   private static void registerSlabToBlock() {
diff --git a/src/main/java/com/enderio/core/common/util/CreativeTabsCustom.java b/src/main/java/com/enderio/core/common/util/CreativeTabsCustom.java
index 68e51d52..73d0a8ae 100644
--- a/src/main/java/com/enderio/core/common/util/CreativeTabsCustom.java
+++ b/src/main/java/com/enderio/core/common/util/CreativeTabsCustom.java
@@ -42,7 +42,7 @@ public CreativeTabsCustom setDisplay(@Nonnull ItemStack display) {
   }
 
   @Override
-  public @Nonnull ItemStack getTabIconItem() {
+  public @Nonnull ItemStack createIcon() {
     return displayStack;
   }
 }
diff --git a/src/main/java/com/enderio/core/common/util/ForgeDirectionOffsets.java b/src/main/java/com/enderio/core/common/util/ForgeDirectionOffsets.java
index b2585e70..05e36a56 100644
--- a/src/main/java/com/enderio/core/common/util/ForgeDirectionOffsets.java
+++ b/src/main/java/com/enderio/core/common/util/ForgeDirectionOffsets.java
@@ -10,7 +10,7 @@ public final class ForgeDirectionOffsets {
 
   static {
     for (EnumFacing dir : EnumFacing.values()) {
-      OFFSETS[dir.ordinal()] = new Vector3d(dir.getFrontOffsetX(), dir.getFrontOffsetY(), dir.getFrontOffsetZ());
+      OFFSETS[dir.ordinal()] = new Vector3d(dir.getXOffset(), dir.getYOffset(), dir.getZOffset());
     }
   }